public static void main(String[] args) {
Cleanser x = new Cleanser();
x.dilute();
x.apply();
x.scrub();
print(x);
}
// Test the new class:
public static void main(String[] args) {
Detergent x = new Detergent();
x.dilute();
x.apply();
x.scrub();
x.foam();
print(x);
print("Testing base class:");
Cleanser.main(args);
}
// Change a method:
public void scrub() {
append(" Detergent.scrub()");
super.scrub(); // Call base-class version
}